hifile: 0.9.9.19 -> 0.9.9.23, make overridable

[ymstnt]

• Updated hifile to 0.9.9.23, fixes the broken build caused by the 0.9.9.19 appimage not being available anymore
• Made changes in how the version and hash is defined, so it can be easily overridden by the user using an overlay
• Simplified the update script to work with said changes

I found these changes to be necessary as hifile only keeps the last 3 versions available for download on their download site. This and the auto-updating being slow process resulted in hifile 0.9.9.19 not being available anymore and causing a build failure.
To combat this in the future, I've made changes so that the user could temporarily manually override the version and related hash locally, using an overlay, like so:

(final: prev: {
  hifile = prev.hifile.override {
    version = "0.9.9.23";
    hash = "";
  };
})

These changes are reflected in the updater script as well to not cause issues.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[nixos-discourse]

This pull request has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/prs-ready-for-review/3032/5308